Huh. No. The show hasn't started shooting the live segments yet, but it looks like some of--at least one of--the new animated songs for Yo Gabba Gabba's second season is already online. [At least it looks like that if you haven't seen all the Season 1 episodes. -ed]
NY motion graphics studio Pandapanther's song, "Mika's Marshmallow Train" has been making the rounds the last couple of weeks, turning up on Videolog, the Brazilian YouTube. If you're feeling a little less transgressive, you can watch an old-fashioned Quicktime version on Pandapanther's site, too. Go figure.
[update: Go figure indeed: how long does it take some hipster design blogs to catch on to a YGG clip that's been airing for months? Jason points out that this is from Season 1. Well, it's New To ME!! sheesh.]
"Mika's Marshmallow Train, by Pandapanther for Yo Gabba Gabba [pandapanther.com via notcot]